Printer concentrator system



Sept. 20, 1932. A. J. MOTTO PRINTER CONC ENTRATOR SYSTEM Filed Aug. 14,1930 l I v vvvvv INVENTOR ANTHONY J. MUTTO ATTORNEY ANTHONY J.

"and monitor circuits by which magnet Patented Sept. 20, 1932 UNITED-STATES PATENT OFFICE MOTTO,' OF BROOKLYN,

NEW YORK, ASSIGNOR TO INTERNATIONAL COM- MUNICATIONS LABORATORIES, INC.,OF YORK, N. Y., A CORPORATION OF ORK Application filed August Thisinvention relates to telegraph eX- changes and more particularly to thecord connections are expeditiously made between a 'subscribers line ortrunk lineand a centrally located instrument, such as aprintingtelegraph or a repeater.

Various devices and manual arrangements have been used heretofore inestablishing connections and supervising the circuits for printingtelegraph trafiic. The object of this invention is to simplify the taskof operating a telegraph exchange by the adoption of a novel combinationof cord and monitor circuits so that the exchange operator need onlyWatch for lamp signals to connect and disconnect subscribers lines withcords leading to various printing telegraph or repeating instruments.

In carrying out the present invention, it will be understood that use ismade of standard relays and pilot lamps in association with the usualtelegraph apparatus. The essence of the invention consists in the novelarrangement of the circuits.

One embodiment of the device is shown in the accompanying drawing inwhich the circuits are divided into several portions as indicated bybroken line enclosures as follows: the operating table for a printingtelegraph is designated 0, the switchboard is marked S, the subscribersstation is marked X.

The usual printer relay 1 is shown con nected in series with a printerkeyboard 2, and a cord tip 3. Relay 1 controls a local circuit whichincludes the printer operating 4. A connecting relay 5 opens and closesthe line circuit through the printer relay and keyboard.

At the switchboard, a subscribers line 6 is shown connected to the cordtip spring 7 of a switchboard jack. A line relay 8 is connected to thisjack in such a manner that a line lamp 9 may be lighted in response to asignal from the subscribers station. Supervisory lamps 10 are shown,both at the printer operating table and on the switchboard, and thecircuit for these lamps is controlled by a relay 11 which hasconnections to a signalling "is the usual 'Relay I pressed,

PRINTER CONCENTRATOR SYSTEM 14, 1930. Serial No. 475,193.

key 12 and also to a contact 13 on the printer relay 1. At thesubscribers station X, there printer relay in the line circuit and theprinter operating magnet 14:. and 15 are shown with biasing coils 17.The subscribers set also includes a key board 16 in series with asignalling key 18. The operation of this device is as follows Undernormal on the line a closed circuit exists in which the line relay 8 iskept energized from the battery 21. This circuit may be traced from thebattery through the winding of relay 8, through j ackcontact springs 23and 7 to the line 6 and thence to the subscribers station the relayarmature 26 will be held to the left, thus opening the circuit for theprinter magnet 14.

Assuming now that the to signal for a connection at the central oflicewith an available printer, the key 18 is dethereby opening the linecircuit and causing the line relay 8 at the switchboard S tode-energize. This causes be closed by the left and right-hand armaturesrespectively. Armature 30 in falling back against contact 31 causes apilot lamp 9 to light, the circuit for which may be traced from thebattery 21 31, also contacts 32 and 330i the jack and thence throughlamp 9 to ground. The armature 34' in falling back against its contact35 short-circuits the winding of relay 8 thereby preventing itsre-energization when a connection is made by .plugging in, or when thesubscriber releases his key 18. The switchboard operator responds to thesignal, as given by the lighted lamp 9, by choosing a cord plug 3 whichconnects with an idle conditions with no trailic be understood to bepolarized and since negative polarity is fed to the line from battery21,

subscriber wishes tw-ocircuits to through contacts 30 and O. Theoperation of relay 5 closes a circuit from the battery 36 and thencethrough the front contact 37 and armature 38, the relay winding 39 andkeyboard 2 to the cord tip 3. The circuit may then be traced through thetip contact 7 of the jack, line 6, and through the subscribers set toground. This positive potential will throw armature 26 of relay 15against contact 29. Thereafter the printer relays 1 and 15 will operatetogether in response to trafiic signals sent from either of thekeyboards 2 or 16, and the printer magnets 4 and 14 will likewisefunction together. At the switchboard when the cord plug is inserted inthe jack, the springs 7, 22 and 23 are separated so that battery 21 iskept off of the line 6. Furthermore, the springs 32 and 33 are separatedso that the line lamp 9 is extinguished. The relay 5, however, is keptenergized from battery 21 during the transmission of messages so thatpotential from battery 36 may be kept on the line.

The lamp circuit which lights the lamps 10 both at the switchboard andat the operating table may be traced from battery 36 through armature38, contact 37, resistance 42, lamps 10, contact 48 and armature 44, toground. The grounded key 12 connects with contact 43 in order to closean operating circuit initially through relay 11.

When the message transmission has been completed, the lamps 10 will beextinguished by the central ofiice operator who simply depresses the key12 thereby operating relay 11 which opens contact 48 and locks up toground through contact 43 and armature 44. Thus a signal is given forthe switchboard operator to withdraw the plug from the jack. Withdrawingthe plug releases relay 5, breaks the operating circuits for relays 1and 5 so that relay 11 is unlocked, but the lamps 10 are prevented fromrelighting by the release of relay 5, and armature 46 is moved to theleft by the biasing coil 17. Hence the printer magnet 4 is deenergizedand all conditions are restored .to normal.

In case, however, before the plug is withmal by pulling the cord plugfrom the jack.

at is claimed is:

1. In a printing telegraph exchange system, a concentration boardprovided with a cord circuit having a printer associated therewith, acord circuit supervisory signal associated with the printer and anotherassociated with the concentration board, a subscribers line circuitterminating in the concentrationboard, a relay in the sleeve of the cordcircuit operable when the cord circuit is connected to the subscribersline circuit for effecting the operation of both supervisory signals, areceiving relay, in the tip of the cord circuit, responsive to theactuation of the sleeve relay, for conditioning a third relay foroperation, and means under control of the printer operator forthereafter actuating and locking the third relay to effect the releaseof both supervisory signals.

2. In a printing telegraph exchange system, the combination according toclaim 1, characterized in this, that the receiving relay is effective,upon an opening of the subscribers line circuit, to release thelockedthird relay, thereby re-operating both supervisory signals.

In witness whereof, I hereunto subscribe my name this 12th day ofAugust, 1930.

ANTHONY J. MOTTO.

drawn from the jack, the subscriber should I again engage the line withthe transmission of messages, the operation of line relay 1 willimmediately break the locking circuit for rei lay 11 through armature 46and contact 13, thereby release relay 11 and cause the lamps 10 to berelighted.

A further result of withdrawing the plug from the jack is to causecontact springs 7 and 23 to close, thereby re-establishing the circuitthrough line relay 8, the line 6 and the subscribers set, negativepotential being applied from battery 21 which actuates relay 15 (aidedby its own biasing coil 17) and opens the circuit through the printermagnet 14.

It will be seen from the above that the entire system is automaticallyrestored to nor-

